During the debugging period of one 600 MW unit

vibration faulties

such as unstable shaft vibration of high-pressure and medium-pressure rotors

vibration surpassing set standard of low-pressure rotor

shaft vibration surpassing set standard and unstable vibration of generator's rotor etc.

have been discovered.Results of frequency specturm analysis shows that the main causes leading to vibration are unblance of the rotor

deviation in rotor fabrication

and impact-rubbing between movable and stationary parts etc..After implementation of some measures

such as high-speed dynamic balancing compensation

rescraping the oil retainer of bearings etc.

excepting bearing no.7 of the generator rotor in x-direction

and bearing no.8 in x-and y-directions

the shaft vibration of other bearings all are 50 μm

the bearing shoe vibration 15 μm

the vibration faulties all being eliminated.